Cooling motion-picture projectors and films



Jan. 1, 1924. l 1,479,630

E. A. sPERRY COOLING MOTION PICTURE PRCJECTORS AND FILMS Filed April l5 1920 2 Sheets-Sheet 1 lNvENToR 2mm d5/25mn f/'ls ATTORN Y l Jan. 1, 1924 1,479,630

i E.A.SPERRY COOLING MOTION PICTURE PROJECTORS AND FILMS Filed April 1s. 1920 2 sheets-sheet 2 Oooooo i Ooooooo" msm/5 INVENTOR 2Min fl. 5pm/m HAS ATTORNE Patented Jan. 1, 1924.

PATENT OFFICE.

ELMEB A. SPERRY, 0F BROOKLYN, NEW YORK.

COOLING MOTION-PICTURE PROJECTORS AND FILMS.

Application filed April 13, 1920. Serial No. 373,496.

To ali who/m, if may cmwem:

Be it known that I, ELMER A. SPERRY, a citizen oi the United States of America, residing at i505 Albemarle Road, Brook- 1 n, iii the county of Kings and State of ew York, have invented certain new and usefoi impeovements in Cooiing `iillotiori- Picture Projectors and Fiims, of which the oiiowiiig is e specicetion.

This invention reiates. to motion picture projecting apparatus, and more speciiiceiL to the cooiiiigg; and Veiitiiatioii oic certei ports oi the apparatus. v

in motion picture machines in generati the iight source is not or very high power, end consequently the heet emanating therefrom is not of greet intensity. But iii eii maw chimes some extent and especioiij/ the higher cioss machines used for ioiig range projecting and high queiity reproduction, the heet produced Toy toe iight source is more or iess e prcbieiii and not infrequeiitiy causes domage to the iene systems sind other the apparatus es weii es to the i'iiiiis., pifohiem obvioiisiy oecomes mcse i postent es e type oi iight source is iirm @ved and especie'iiy so where tio own types oi' aitiiiciei iight,

sucii e or semi-high intensity src iig? wom the matelots to Speiry The oioject oi" the iiiilentiori is to devise e method means ici eutometiceiiy and e'lectiveiy verijtiistiog the iamp `Ahouse and cooiing; tiie mechanism, the ieiises and the portion itsk pessing tir1 i iigiit iiigii powei? espec the type Reieiri n here ii ifiow eoiisideiito ice the preeired forel of my invention:

i e sectioiiei side 'eievetioii of e house showing 'the embodiment oi" my ie drewiiigs wherein il' Fig. 6 is a. modification of tile iamp ventiioting biower. l

In Fig. 1 the ianip house is shown at i, and contains the iamp mechanism 2 and the positive and negative eiectrodes 3 eiid e, The positive electrode is gripped oy a siee've 50 rotatably heid oy e carriage iii, seid carriage being siidebiy mounted ou e,

'guide rod 62 and in threaded engagement with screw rod 63., Rod 62 ce gem' @Limeshiiig with gem 65 .on roe 63., A reciprocating member #88 actuated 'by riiotoiq i6 may have o. pewi o? 'to engage and rotate gear 65 and time rotate rods '52, 53. Rotation of rod 53 wiii eiect ieeciiieg oi eiectiode 3, whiie otetioii oirod 52 wiii through pinion 63 meshing with gear 3S eiect rotation of said eiectrode.y A more det M'ed disciosure oi the :foregoing meciieoi contained iii the oopeiidiiig eppiice Theodore Heli., Seriei No., BWa-B, ioctio'ii picture piogec'tors, iiied Ape. 30, i020. The priocipei emeiietes time crstei1 5 or the positive eiec'ti-ode, e".- siiowii is eritireiy unobstructed i i segs to the condenser 6. Seid c obviousiy corov Jise i. but is siiowii here i he most osos e pei? of ojposiLQ 1 disposed ieiises 7, 8, c t etteciieci 'to tiie isop resent the di peiisiiiggg and receiving im, the iiim is guided eetue' :mechanism represeoted et ibi Beiow the iiouse sir passage or c; oi which ice position comiectedicy ineen iiieciieois forth. A en seid motor n opening i9 w reguiatmg door 'the direction oi chamber i5, beiow the A provide en opening ee current of oir to sweep upwerdiy o. the iight source and ero iii-me suderouiid the hearted portiozos of the mechanism as indicated by eirows 23 'for coolingI tie mechanism and cairyiiig the fumes :mo eet produced by the are out of the lempiioose through an opening or chimney 24., wiiioii may lead out thifougii the wsii or ceiiiiig 49 (see Fig. 5) of the room and out of doors if desired. Preferably the airl currents should not come in contact with the arc.

dame, as otherwise unsteadiness of said.

tlame may result. Also it is desirable that the air currents be kept out of contact with the arcing tips of the electrodes, as the temperature of the latter should be kept as high as possible in order to obtain the maxiing 22, and the air currents are permitted to pass upwardly on each side thereof, as indicated b the arrows. A shutter may be provide for the opening 22, so that the force of the air blast may' be regulated. Actuation may be effected through a knob 26 on rod 27 to"which saidv shutter is atf tached. @bviously the air being drawn in l by fan 18 will, by passing over and through motor 16, serve to keep t e said motor cool.

For cooling the condenser, I have shown a conduit 28 connected with air chamber 15, and branching outwardly at 29 and having a plurality of outletsl 30,4 31,32. rIhese outlets may be long narrow slots as shown in Fig. 2; the slots being preferably substantially equal in length to the width of the lenses 7 and 8 and being so positioned thatair issuing therefrom will sweep upwardly over 'the several surfaces of said lenses as indicated by arrows 33. A shutter 25. actuated through thumb nut 26 may he provided for regulating the ow of air over the lenses. The air blasts for the lenses and for the light fumes and light mechanism will also supply a considerable current of cooling air for the space` between the light lsource and condenser. Additional openings 48 may be provided around' the housing 1 .for permitting air to be drawn in and upward through the chimney 24 for general ventilation and ,cooling.

Another conduit may be provided as shown leading outwardly' as at 34 and upwardly as at 35, adjacent to one edge of the film 13 as seen in Fig. 2. Branches ,36, 37 reaching laterally adjacent the opposite faces 38, 39 4of the film are provided with slots 40, 41 so positioned asto direct parallel currents of air over the opposite faces of the iilm as indicated by arrows 42 where said film passes through the light beam 43. As shown in Fig. 4 the slots 40, 41 are so arranged that the air issuses therefrom in the direction represented by arrows 73, 74, so lthat the air actuallv imninges the Surrat-rasca faces of the Hlm with considerable force as indicated, and sweeps over said surfaces in the direction opposite to the direction of movement of said film as represented by arlrow 75, linI this vway the heat absorbed by the hlm and especially by the darker sections of the emulsion will be vigorously extracted, thus preventing the hlm from hecoming hot enough to be damaged. The flow of air upon the lilm may be regulated by means of a shutter 25, actuated through a't-humb nut 26".

ln Fig, 3 I 'have shown a modification wherein the air for coolin the condenser lenses 7, S may be supplied y an independent source, such as a blower 44 actuated by a motor 45. Said blower may be connected directly with conduit 28.

A modihcation in connection with the cooling of the film is shown in Fi 4 wherein a separate blower 46 actuated y a motor 47 may be connected directly to conduit 35.

F ig. 6 represents a separate blower 53 for furnishing the air blast for the opening 22 to carry off the products of combustion. In this view, one or two jets 54, 55 may be employed for causing the air to pass byone side 56 or the other side 57 of flame 58, 0r both sides. With this construction it will be seenv that the 'air is directed u on portions .of the electrodes distant rom the arcing tips thereof. At the same time the air currents pass suiciently near the arc dame to Withdraw fumes. from the .arc Withouhowever, causing iiickering of the Hama fpurpose each of the blowers 44, 46, and 53 is shown as adapted to be supplied with current through wires 70, 71; a rheostat 72`being included in thecircuit so as to vary the current.

In Fig. 5 I haveshown another modification.-

carries thelm, and4 is movable with respect thereto, as for instance on al track 51. In such machines, where the one fan 18 on motor ldis used to supply all of the cooling air, a flexible conduit 52 may be connected between the air chamber 15 and the portion 50 to supply the'air for the cooling of the film. Adjustment of the lamp house may thus bemade without interfering with the su ply of air for the lm. L A v n accordance with the provisions of the patent statutes, I have herein described the principle of operation of my invention, to-

In motion picture projectors the y lamp house 1 is frequently constructed asf aseparate unit from the portion 50 whichof. but I desire to have it understood that the apparatus/shown is only illustrative and that the invention can be carried out by other means. Also, While it is designed to use the various features and elements in the combination and relations described, some of these may be altered and others omitted without interfering with the more general resuits outlined, and the invention extends to such use.

I-Iaving described my invention, what I claim and desire to secure by Letters Patent is:

l. In a motion picture projectinlg apparatus, means for carrying a film, and means for directing parallel currents of a cooling fluid against opposite sides of the film and longitudinally.

2. In a motion picture projecting apparatus, a light source, a lens associated therewith, and means for causing concentrated unidirectional currents of cooling luid to pass over both surfaces of said lens.

3. In a motion picture projecting apparatus, a lamp house, a lamp within said house, means for actuating said lamp, said means being also adapted to produce a` current of air, and means fordirecting said air through said lamp house for Ventilating the same.

4. In a motion picture projector, alight source, a condenser associated therewlth, means for positioning a film in predetermined relationship to said condenser and source, a fluid conductor havinlg vents located adjacent said source, said condenser, and said positioning means for supplying a coolin fluid to the source, condenser and film, an means for charging said conductor with a cooling fluid.` j

5. Ina motion picture projector, a lamp house adapted to contain a lightisource, ani` optical lens system associated with said house, lm positioning means, an air conduit,

means for supplying air under pressure to said conduit, said conduit being provided with outlets adjacent said light source, said lenses, and said positioning means, the outlet adjacent the lenses being adapted to direct a. current of air over the several surfaces of said lenses and the outlet adjacent the positionin means being adapted to direct a cur- 7. In a motion picture projecting appa.

ratus, a housing, arc light mechanism Within said housing, means for producing a current of air, means for directing said air adjacent said mechanism for Ventilating said housing, and means for preventing said air current from contacting Withnthe arc ame.

j 8. In a motion picture projecting appay ratus, arc light mechanism, a housin therefor, means for drawing air throu said housing and means for directing sai air adjacent the arc flame but out of contact therewith. J

9. In a motion picture projecting apparatus, .arc light mechanism including a pair of electrodes, a housing for said mechanism, means for producing an. air current and means for ,directing said current adjacent said electrodes at a. distance from the arcing tips thereof.

In testimony whereof I have aixed my signature.

,ELMER A. SPERRY. 

